Floor sander



y A. E. FORSON, SR 1,360,775

FLOOR SANDER Original Filed June 25, 1929 3 Sheets-Sheet 1 A? O a 4 43 j A! g 9/ g 4,; Invenior m /4 fly'eZzf orsara J71 A itorney May 3l, 1932.

A.E.FQRSON.SR

FLOOR SANDER Original Filed June 25, 1929 3 Sheets-Sheet 2 Inventor d Wedlflrsm, J)?

May 31, 1932. A. E FORSON, SR 1,860,775

FLOOR QANDER Original Filed June 25, 1929 5 Sheets-Sheet 3' 4 3 d7 fl/jrqfi/fl 4;

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& waoiih Attorney Patented May 31, 1932 TES.

i'PATE,

ALFRED E. FORSON, SR., 01? RENO, NEVADA, ASSIGNOR OF FORTY-N'INE PER CENT T CHARLES L. RICHARDS, OF RENO, NEVADA i FLOOR SANDER Application filed June 25, 1929, Serial This invention has relation to certain new and useful improvements in sandpapering machines and has, as its primary object the provision of a floorsand papering machine g which will be of simple construction and operation as well as highly efficient in use.

Another very important object of the invention is to provide a floor sander, the construction of which will not mar the floor or to similar body when the same is moved over the floor in an abrading operation.

Another very salient feature of this inventionis in the provision of a wheeled frame and a sand paper block which is so mounted with respect to the same as to be operatlvely associated withia prime mover carried by the wheeled frame, whereby the sand paper block may be moved backward or forward upon the floor in contact with the floor while the entire device isv being moved over the floor to be treated.

, Other objects and advantages of the invention will become apparent during a study of the following description, taken in connec- 2 tion with the accompanying drawings, wherein:

Figure 1 is a side elevation of my improved sander.

Figure 2 is a detail sectional view, taken 80 on the line 2-2 of Figure 1.

Figure 3 is a sectional view, taken on the line 33 of Figure 1. V

Figure 4 is a detail sectional view, on the line l4 of Figure 3.

Figure 5 is a fragmentary front elevation of the pusher handle of the device. I

Figure 6 is a fragmentary detail view, partly in section, and partly in elevation, showing-the bracing means between the upright members of the handle. a

Figure 7 is a view partly in section and partly in elevation of my improved sand pa-' per carriedblock.

Figure 8 is a view partly in section and partly in elevation, illustrating the manner of associating the front axle supporting memher with the plane. 7

- Figure 9 is a detail view, partly 'insection,

and partly in elevation, illustrating the man;-

No. 373,548. Renewed April 6, 1932.

her of associating the rear guide wheel with the frame. a

Figure 10 is a vertical transverse sectional view, taken through the large pulley wheel.

With reference in detail to the drawings,

intermediate their ends, one to each of the crown portion 5 of the wheel supporting frame. At their forward ends, each of the members 9-9 are bent downwardly as "at 1010. A forwardly disposed vertical inverted U-shaped frame 11 has each of its legs 12 12 secured to the downwardly extending end portions 10 of the members 9, through the medium of screw bolts or other fastening 1 elements, designated generally as at 18. A

pairof elongated braceibars or straps 14 have their intermedi-acies extending between the legs 6-6, the forward ends of these members 14 being secured as at 15, to the extremities of the respective legs 12-12 of the U shaped members 11 (see Figure 1). Adjacent their other ends each of the members 14t14 are secured to the adjacent extremities of the wheeled frame members 99, asa-tl-o, the

extremities of the said members 14 extending beyond and rea-rwardly of the ends of the frame members 9-9 and reconnected by a cross member 17. As shown in Figure 9, a

yoke 18, supporting between itslegs a rubf ber tired wheel 19 is swivelly connected to the intermediacy of the cross memberl? as at 20,. The wheel 19 provides the rear guide wheel for the wheeled frame A as isapparent- A suitable platform or base member 21 ,is supportedon the frame members 9 9, being secured thereto through the medium of bolts 2-22, which pass through the crown 5, the

. strap members 99 and the platform 21, as shown to advantage in Figure 8. Other fastening elements include bolts 23,which pass through spaced members 14, the members 9 and the platform 21 adjacent the rear end of the platform as shown to advantage in Figure 1. Suitably fixed to the platform 21 is an electric motor 24, said motor 24 being of conventional construction. 7 v

Rising from and extending upwardly and rearwardly of the rear frame is a substantially inverted U-shaped handle comprising the vertically disposed spaced parallel legs 26, said legs at their lower ends being fixed to the extremities of the cross members 17' and adjacent ends of the bracing members 14 in any suitable manner such as is designated generally as at 27. The legs 26 of the handle are connected at their upper ends through the medium of a cross pipe 28 being connected to the respective legs through the medium of suitable elbow connections 29. Intermediate their ends, the legs of the handles 2626 are connected through the medium of a suitable cross strap 30, the ends of the cross strap 30 being disposed about the respective legs 26, the extremities of the strap 30 being secured to the body of the strap through the medium of suitable bolt or fastening elements 3131, as shown to advantage in Figure 6. A brace bar 32 has one end bolted as at 33, to an intermediate portion of the bight 11 of the inverted U-shaped frame structure 11, said brace bar 32, extending rearwardly and upwardly to be connected at its opposite end as at 34, to an intermediate portion of the A crank shaft 25 has its opposite end journalled in bearing brackets 3636 fixed to the inner vertical faces of the respective legs 1212 of the U-shaped frame 11, intermediate the ends of the leg. liroma study of Figure 3, it'will be noted that one end of the crank shaft extends laterally of one of the legs 12 and has secured to the end, through the medium of a suitable flanged collar 37, a relatively largepulley wheel 38. Adjacent their lower ends, and upon the opposite vertical faces of the legs 1212 a crossbar 39 has its opposite ends fixed to saidlegs,thebolt 13 passing through the portions 10 of the frame'm'e'mbers 99, the said legs 12 -12 and the adjacent ends of said cross member 39. This cross member is in the nature of a guide supporting member, having extendingforwardly therefrom and in spaced parallelism a pair of horizontally disposed guide rods 40 40. These guide rods 404O are provided at one end with reduced threaded portions extending through suitableopenings, formed in the said guide supporting member 39, for threaded engagement with suitable thumb nuts 4141 respectively. I (See Figure 4).

The sanding elements, indicated generally by the reference character B, comprises a edge of the sand paper sheet to the adjacent edge of the block 42, I provide an elongated metallic, strap 44, between which and the adjacent edge of the block, the said end of the sheet is disposed, the bolt 45 extending in spaced relation through the said strap 44, the end of the paper and the adj acent' end of the block 42, in an obvious manner.

At its forward end, the paper is bent .upwardly and then inwardly to rest upon the upper surface of the block 42, whereupon I employ a suitable metallic strap 46, similar to the strap 44, for clamping the said end of the sand paper between said straps and the adjacent portions of the blocks 42. A weighted plate or block 47, is secured to and is supported on the upper face of the sand paper carrying block 42. A. pair of tubular guidesleeves 4848 are disposed'in longitudinal spaced relation upon the weighted block 47, being secured thereto and maintained in spaced relation throughsuitable brackets 49, engaging the guide sleeves 48, forwardly and rearwardly of the sleeves, the intermediate portions of the brackets 49 resting upon the said block 47. An attaching member 50 has its body portion disposed between the guide 48 and resting on the inter:

m'ediacies of the guide bracket 49,- bolts 51 passing through the block 47, and the said intermedia-cies of the brackets 49 and the body of the attaching member for'clamping said block, bracket and attaching member together (see Figure 7) The attaching member 50 is in the nature of a single flat-metallic bar bent upwardly at right angles at one end to provide the vertical extension 50,

apertured at its upper end as at 50".

A suitable hinge member 52 is fixed to the upper end of the vertical extension of the motion to the sand paper carrying block, 7

there is provided a connecting rod 53, one end of which is fixed to th'eremain'ing leaf of the spring 52, being bolted thereto as at 54, the opposite end of the connecting rod terminating in a bearing for connection as at 53, with the crank portion 36 of the crank shaft 35. r

:Upon the armature shaft of the electric motor 34, there is fixed a'suitable power pul- 1; claims.

ley of relatively small diameter, said pulley being designated as at 24, and a pulley belt is trained over said pulley 24 and the relatively larger pulley carried by the crank shaft 25, the last mentioned pulley being designated as at 38.

Thus it will be seen that upon operation of the motor 2%,the crank shaft 35 will be suitably rotated, whereby through the medium of the crank and the connecting rod 53, reciprocatory motion will be imparted to the sandpaper carrying block 42.

From the foregoing then, it will be seen that one may push the device about the floor as desired, at the same time the sand paper carrying block is pushed back and forth, bringing the sand paper in abrading contact with the floor, to be treated.

From the foregoing it will also be seen that with this machine the floor may be scraped or sand papered even at its edges and clear up to the base board and into the corners without damaging the base board. Further it will be appreciated that a machine of this 1 character is strong, durable, positive and practical in operation, thoroughly efficient and otherwise well adapted for the purpose designed.

Even though I have herein shown and described and preferred embodiment of my invention, it is to be understood that the same is susceptible to changes fully comprehended by the spirit of the invention as herein described and the scope What is claimed is;

of the appended bers rising from the forward end of said frame, bearing brackets carried by each of said members, a crank shaft having itsend portions journaled in said bearing brackets, a pulley wheel on one end of said crank shaft, said electric motor having a pulley wheel on the armature shaft thereof, a power belt trained over said pulley wheel, a cross member at the lower ends of said vertical members, bolts passing through said wheel frame, said vertical members, and the adjacent ends of said cross member, a pair of spaced parallel guide rods extending forwardly from an intermediate portion of said cross mem ber, an abrasive block, spaced sleeve bearing members carried by said abrasive block and adapted to be slidably mounted on said guide rods, an attaching member rising from said guide block intermediate said bearing sleeve, a connecting rod extending from the crank of said crank shaft, and a hinged connection between said connecting rod and said'attaching member all in the manner and for the purpose specified.

In testimony whereof I afiix my signature.

ALFRED E. FORSON, SR.

1. A sand papering machine of the class described comprising a wheeled frame, a push handle member extending upwardly and rearwardly from the rear end of said frame, an inverted U-shaped frame member extending upwardly from the forward end of the first mentioned frame, a rearwardly and upwardly inclined bracket bar connecting sa1d inverted U-shaped frame with said handle member, an electric motor supported on the wheel frame, a crank shaft journaled in the said second mentioned frame, means operatively connecting the crank shaft with the electric motor, a cross member carried by said inverted U-shaped frame at the lower end of said frame, a pair of spaced parallel guide rods extending forwardly from said cross members, a reciprocable abrasive member slidably supported by said guide rods, a connecting rod having one end slidably associated with the crank, of said crank shaft, the opposite end of said connecting rod having operative connection with said abrasive block.

2. In a sand papering machine of the class described, a wheel supported frame, a handle member rising upwardly and rearwardly from the rear end of the frame, an electric motor carried by said wheeled frame,'a pair of vertically disposed spaced parallel mem- 

